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|Title:||Improvement of palladium limit of detection by microwave-assisted laser induced breakdown spectroscopy|
|Author:||Al Shuaili, A.|
Al Hadhrami, A.
|Citation:||Spectrochimica Acta Part B, 2019; 159:105666-1-105666-7|
|Ahlam A. Al Shuaili, Ahlam M. Al Hadhrami, M.A. Wakil, Zeyad T. Alwahabi|
|Abstract:||Detecting elements such as heavy metals is important in many industrial processes. The techniques currently used are time consuming and require excessive sample preparation. In this paper, we demonstrate microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) to detect palladium (Pd) in solid samples at ambient conditions. Microwave radiation was introduced by a near field applicator to couple the microwave radiation with the plasma. The results were a 92–fold enhancement in palladium signal with 8-fold improvement in the limit of detection at laser energy levels below 5 mJ (1250 J/cm² laser pulse fluence). We also investigate the optimum experimental parameters of palladium detection for both laser-induced breakdown spectroscopy (LIBS) and MW-LIBS. The maximum signal to noise ratio improvement was achieved at microwave power of 750 W and laser pulse fluence of 157 J/cm² for Pd I 340.46 nm. Finally, we examine the location of the near field applicator (NFA) with respect to the sample to show that the MW-LIBS signal strength was significantly affected by the vertical position compared to the horizontal. The detection limits of palladium with LIBS and MW-LIBS were 40 ppm and 5 ppm respectively.|
|Keywords:||Laser-induced breakdown spectroscopy; microwave assisted; signal enhancement; palladium detection|
|Rights:||© 2019 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Chemical Engineering publications|
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